Furnace



(Nb Model.)

F; HUNDT.

- Furnace.` y No. 239,788.l Patented April 5,1881;

ILPERS. PHOTO-LITHDGRAPHER, WASHINGTON. DVC,

UNITED STATES PATENT OFFICE..-

FRIEDRICH HUNDT, OF CEIICAGO, ILLINOIS.

lURNACgE.

SPECIFICATION forming part of Letters Application filed. August To all whom t may concern Be it known that I, FRIEDRICH HUNDT, of Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Furnaces, of which the following is a specification.

rllhe object I have in view is to provide a furnace for steam-boilers and other purposes which will produce more perfect combustionA than heretofore, and will prevent the gratebars from burning out, and will at the same time be. simple in construction.

My invention consists in the peculiar means employed by me for accomplishing this object,

as fully hereinafter explained, and pointed out by the claims. I

In the accompanying drawings, forming a part hereof, Figure 1 is a front elevation of the furnace; Fig. 2, a vertical section fzom front to rear on line 2 2;n Fig. 3, a horizontal section on line 3 3, and Fignla vertical crosssection on line 4 4.

Like letters denote corresponding parts in all the figures.

A represents the grate-bars, which are Vinclined downwardly toward the bridge-wall, so as to be self-feeding. At their inner ends they are supported by the brick-work, while at their outer ends they rest upon the frame a of the ash-pit doors B. These grate-bars are made hollowthroughout their length, being open at their outer ends to the exteriorlair, and at their inner ends. being connected with upright tlues C in the bridge-wall, which tlues are formed of slabs or plates b, of fire-clay. Such upright flues C open at their Lipper ends into horizontal tlues D, having bottom slabs, c, and top slabs, d, supported by vertical plates or slabs c, all such slabs being formed of lireclay.

The combustion-chamber E has an arched top, F, of tire-clay, inclined downwardly about parallel with the grate-bars,` and then up wardly to the tops of the horizontal flues D. The side walls, f, ofthe combustion-chamber are lined with slabs of hre-clay, while the frontl end ofthe combustion-chamber is closed by one or two doors, G.

Air is caused to circulate rapidly throughy the hollow grate-bars by the draft, and this Patent No. 239,788, dated April 5, 1881.

12, 1880. (No model.)

air prevents such bars from becoming highly heated, as they otherwise would be, and. thereby makes them much more durable in use. The air which passes through the hollow gratebars is heated to a high degree, and, mingling with the heated gases at the top of the bridgewall, causes their complete combustion, which combustion is materially assisted by the contact of the products or gases with the walls of the horizontal fire-clay lines D.

By having the top of the combustion-charnber inclined downwardly to the rear, about parallel with the inclined hollow grate-bars, the unconsulned gases which rise from the` fresh coal at the upper and vfront end ot' thel combustionchamber are forced on their pas` sage to the bridge-wall intimately into con` tact with the incandescent coal at the lowei` end of such combustiolrchambers These gases become thereby highly heated and are partly consumed, and such portionsot' them as arenot consumed at that point are prepared for.

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complete combustion, which takes place by the admixture of the gases with the heated air at the top ofthe bridge-wall. The ash-pit doors may have air-registers,

and the open ends of Vthe grate-bars may be f provided with,1neans,it' desired, for closing them at pleasure. l

What I claim as my invention is- 1. In a furnace, the inclined hollow gratebars A, connected at the front ot' the furnace with the exterior air and with upright lues C in the bridge-wall, in combination with the inclined top F ot' the combustion-chamber and the horizontal dues D, extending rearwardly from'the bridge-wall, substantially as described and shown.

2. In a furnace, the combination of the combustion-chamber E, having inclined top F, the inclined hollow grate-bars A, the upright liues C in the bridge-wall, formed of slabs b, of re-clay, and the narrow horizontal ues D, formed of lire-clay slabs c cl e, all constructed and arranged substantially as described and shown.

FRIEDRICH HUNDT.

Witnesses:

F. W.KAsEHAcEN, H. A. BAUMANN. 

